Organically modified montmorillonite OMMT

Figure 8.1 shows an example of XRD analysis of an ethylene vinyl acetate/low-density polyethylene (EVA/LDPE) blend modified by an organically modified montmorillonite (OMMT, 5 wt%) [27]. Tests were conducted on a Philips X Pert diffractometer using CuXo, radiation (A. = 154,062 A) in continuous mode (step 0.02°, 1 s acquisition time). The neat... 

The Mechanical and Thermal Properties of Polyoxymethylene (POM)/Organically Modified Montmorillonite (OMMT) Engineering Nanocomposites Modified with Thermoplastic Polyurethane (TPU) Compatibilizer... 

Polymer composites reinforced with inorganic fillers of dimensions in the nanometer range, known as nanocomposites, have attracted great attention of researchers due to unexpected synergistic properties derived from two components. The most studied polymer nanocomposites (PNs) are composed of thermoplastic or thermosetting matrix and organically modified montmorillonite (OMMT) l-4] or carbon nanotubes (CNTs) [5-7]. 

The ablation behavior of injeetion molded polystyrene (PS)-Organically modified montmorillonite (OMMT) nanoeomposites by 248 nm KrF exeimer laser irradiation were investigated for different OMMT eoncentration and melt-blending conditions. The surface structures induced by exeimer laser ablation were also studied using SEM. Results indicate that PS-OMMT nanocomposites show improved or decreased resistance to exeimer laser irradiation depending on the OMMT concentration. The dispersion state of OMMT may play an important role in exeimer laser ablation behavior of PS-OMMT nanocomposites. 

Na-montmorillonite (MMT) was purified by dispersion of crude clay into deionized water and separation of non-colloidal impurities. To obtain cation exchange process, the purified MMT was swollen in deionized water for 24 h agitation at room temperature and a certain quantity of 1-octadecylamine was added. The system was maintained at around 68 °C for about 4 h and then filter and repeatedly washed with deionized water. The product was then dried, crushed, and sieved with 325-mesh to obtain organically modified montorillonite (OMMT). The main objective for the modification of nanoclay montmorillonite consists in or-ganophilization of clay in order to improve the compatibility with epoxy resin blends. Otherwise, the polymer and the clay will form a separate phase system with a low interface among the various components. 

Un-OH can also be copolymetized with propene on a MAO-pretreated glass surface by Et(Ind)2ZrCl2. Parts of the resulting copolymer are chemically bonded to the surface, as shown by extraction experiments, scanning electron microscopy (SEM) microscopy as well as Fourier transformation infrared spectroscopy (FUR) analysis. Similar results were reported for the copolymerization of ethene with Un-OH by the same catalyst system on the organically modified silicate montmorillonite (OMMT) resulting in PE-Un-OH/OMMT nanocomposites which consist of well-exfoliated OMMT dispersions and controlled degrees of PE functionalization. ... 

---